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SC1578 - HIGH-EFFICIENCY STEP-DOWN DC-DC CONVERTER

Datasheet Summary

Description

The SC1578 is a high performance step-down DC-DC converter, designed to drive an external P-channel MOSFET to generate programmable output voltages.

Features

  • 4V to 24V input voltage operation.
  • High efficiency (up to 95%).
  • Low quiescent current at 90µA.
  • Pulse-skipping and pulse-frequency modulation.
  • Inputs-uncommitted current sense comparator.
  • Duty cycle adjustable.
  • 90kHz to 280kHz oscillator frequency.
  • Power-saving shutdown mode (8µA Typical).
  • Push-pull driver output.

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Datasheet preview – SC1578

Datasheet Details

Part number SC1578
Manufacturer Semtech Corporation
File Size 130.52 KB
Description HIGH-EFFICIENCY STEP-DOWN DC-DC CONVERTER
Datasheet download datasheet SC1578 Datasheet
Additional preview pages of the SC1578 datasheet.

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Full PDF Text Transcription

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HIGH-EFFICIENCY STEP-DOWN DC-DC CONVERTER January 29, 1998 SC1578 TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com DESCRIPTION The SC1578 is a high performance step-down DC-DC converter, designed to drive an external P-channel MOSFET to generate programmable output voltages. Two main schemes of pulse-skipping and pulsefrequency modulation are employed to maintain low quiescent current and high conversion efficiency over wide ranges of input voltage and loads. The SC1578 delivers 10mA to 2A of output current with 87%-93% efficiency at VIN=9V, VOUT=5V. A current sense comparator with both inverting and non-inverting inputs uncommitted is included to provide the crucial function of either current limit protection or constant output current control.
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